66761579494 has 16 divisors (see below), whose sum is σ = 101292498432. Its totient is φ = 32998956928.

The previous prime is 66761579491. The next prime is 66761579497. The reversal of 66761579494 is 49497516766.

It is an interprime number because it is at equal distance from previous prime (66761579491) and next prime (66761579497).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66761579491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299089 + ... + 472204.

It is an arithmetic number, because the mean of its divisors is an integer number (6330781152).

Almost surely, 2^66761579494 is an apocalyptic number.

66761579494 is a deficient number, since it is larger than the sum of its proper divisors (34530918938).

66761579494 is a wasteful number, since it uses less digits than its factorization.

66761579494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771791.

The product of its digits is 68584320, while the sum is 64.

The spelling of 66761579494 in words is "sixty-six billion, seven hundred sixty-one million, five hundred seventy-nine thousand, four hundred ninety-four".